Matched to an execution-style triple-homicide near Columbia University by DNA, a recovered gun, and his own admission to cops — “I saw myself on TV–” a dimwitted accused murderer still pleaded not guilty today.

“Coward!” one victim’s uncle shouted in Spanish from the audience as Roberto Nunez, 30, was led back to jail, where he awaits the disposition of three counts of first degree murder.

The three victims — Luis Catalan, 25, Heriberto Suazo, 26, and Amaury Rodriguez, 30, were found shot dead in a BMW on West 122nd Street. Sources told The Post that the three were known for ripping off other drug dealers, and that the slayings were in retaliation for those thefts.

A shirt bearing Nunez’s DNA — on record from a 2003 violent robbery — was left at the scene, prosecutors say.

A .38-caliber revolver with ballistics matching the shooting turned up days later — when it was sold by one of Nunez’s acquaintances to a gun dealer who turned out to be an undercover cop, police said.

“The defendant is facing life without parole,” assistant district attorney David Drucker told Manhattan Supreme Court Justice Thomas Farber, who ordered that Nunez remain held without bail.

“Tell them to add another count, because he killed me, too,” Catalan’s mother, Norma Castellar, said outside court. “He’s killing me 1,000 times,” she cried. “Every time I can’t see my son.”

“The defendant has now been indicted for shooting three people point-blank while sitting beside them in a car, and leaving their bodies on display for all to see,” said District Attorney Vance. “This violence shocks the conscience and is unacceptable.

“My Office will continue to aggressively prosecute violent crime and the drug trade that fuels the proliferation of guns on our streets,” he said.